Argo CD Invalid SSH key error

What is Argo CD Invalid SSH key error

Understanding Argo CD

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. It automates the deployment of the desired application states in the specified target environments. By continuously monitoring Git repositories, Argo CD ensures that the live state of your applications matches the desired state defined in Git.

Identifying the Symptom

When using Argo CD, you might encounter an 'Invalid SSH key error'. This error typically appears when Argo CD attempts to access a Git repository using SSH and fails due to an invalid or misconfigured SSH key.

Common Error Message

The error message might look like this:

Failed to connect to the Git repository: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

Details About the Issue

The 'Invalid SSH key error' occurs when the SSH key configured in Argo CD does not match the key expected by the Git repository. This can happen if the key is incorrectly configured, expired, or lacks the necessary permissions.

Root Causes

The SSH key is not added to the Git repository's access list. The SSH key is incorrectly configured in Argo CD. The SSH key has expired or is invalid.

Steps to Fix the Issue

To resolve the 'Invalid SSH key error', follow these steps:

1. Verify SSH Key Configuration in Argo CD

Ensure that the SSH key is correctly configured in Argo CD. You can check this by navigating to the Argo CD settings and reviewing the repository credentials.

argocd repo list

Ensure that the repository URL and SSH key path are correct.

2. Validate SSH Key in Git Repository

Make sure the SSH key is added to the Git repository's access list. For example, if you are using GitHub, add the SSH key to your account's SSH and GPG keys settings. Refer to GitHub's documentation for detailed steps.

3. Test SSH Key Locally

Test the SSH key locally to ensure it can access the repository:

ssh -T git@github.com

If the key is valid, you should see a success message. If not, troubleshoot the SSH key configuration.

4. Update Argo CD with Correct SSH Key

If the SSH key was incorrect, update Argo CD with the correct key:

argocd repo add --ssh-private-key-path

Replace <repository-url> and <path-to-private-key> with your repository's URL and the path to your SSH private key, respectively.

Conclusion

By following these steps, you should be able to resolve the 'Invalid SSH key error' in Argo CD. Ensuring that your SSH keys are correctly configured and have the necessary permissions is crucial for seamless GitOps workflows. For more information, you can visit the Argo CD documentation.